3.3.3.5 Performing a GNSS Receiver Survey
Note: This topic only applies to stationary applications – in Mobile receiver
mode NO surveys will be carried out since the position is updated con-
tinuously.
When VersaSync's integrated GNSS receiver performs a survey, it tries to determine or
verify its geographic position with high accuracy. An accurate geographic position is
required to calculate a precise system time from the GNSS reference.
During a GNSS survey, the position will be iteratively recalculated while gradually increas-
ing the position accuracy. A survey can take up to 33minutes, but typically VersaSync will
synchronize earlier, i.e. offer a valid Timeand 1PPS reference, once it has obtained a suf-
ficiently accurate preliminary position.
Note: If a system has been moved, in Standard receiver mode and Land
Dynamics, receivers will automatically re-survey on reboot. In Standard
mode and Stationary Dynamics, the unit will survey only once, and will not
re-survey on reboot.
Initiating a GNSS Survey
The standard behavior is that a power cycle or a reboot will automatically initiate a GNSS
survey. To reboot your unit, navigate to TOOLS > SYSTEM: Reboot/Halt.
While it is crucially important to carry out a resurvey after a unit has been relocated (e.g.,
when commissioning a new unit), a resurvey is normally not required if a stationary unit is
rebooted for other reasons. To turn off this functionality, see "Setting GNSS Receiver
Dynamics" on page180.
Verifying GNSS Survey Progress
To see if VersaSync's GNSS receiver is performing a survey and if so, verify its progress:
1.
Navigate to INTERFACES > REFERENCES: GNSS 0.
2.
The survey status (ACQUIRING, COMPLETE, or progress in percent) is displayed
under the line item Survey Progress.
3.3 Managing References
CHAPTER 3 • VersaSync User Manual Rev. 7.0
183
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